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Microcrack coalescence and macroscopic crack growth initiation in brittle solids

Ortiz, M. (1988) Microcrack coalescence and macroscopic crack growth initiation in brittle solids. International Journal of Solids and Structures, 24 (3). pp. 231-250. ISSN 0020-7683. http://resolver.caltech.edu/CaltechAUTHORS:20180104-150149978

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Abstract

The problem studied in this paper concerns the analytical estimation of the effect of microcracking on crack growth initiation in brittle solids. Particular attention is given to the counteracting effects of toughness degradation and shielding by macrocracking. with a view to determining the range of dominance of each mechanism. Crack growth initiation by coalescence with microcracks is studied with the aid of a cohesive zone model. The extent of shielding of the crack tip by the intervening microcracks is estimated under isotropic damage conditions. A comparison of these effects reveals that, were the crack capable of growing within its plane, the toughness enhancement derived from shielding would be almost exactly counterbalanced by the reduction of toughness in the microcracked material. However, if microcrack deflection is taken into account levels of toughening consistent with experimental data are computed.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/0020-7683(88)90031-5DOIArticle
http://www.sciencedirect.com/science/article/pii/0020768388900315PublisherArticle
Additional Information:© 1988 Elsevier. (Received 3 December 1986; in revised form 7 July 1987) The support of the Office of Naval Research through grant N00014-85-K-0720 is gratefully acknowledged.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-85-K-0720
Record Number:CaltechAUTHORS:20180104-150149978
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180104-150149978
Official Citation:M. Ortiz, Microcrack coalescence and macroscopic crack growth initiation in brittle solids, In International Journal of Solids and Structures, Volume 24, Issue 3, 1988, Pages 231-250, ISSN 0020-7683, https://doi.org/10.1016/0020-7683(88)90031-5. (http://www.sciencedirect.com/science/article/pii/0020768388900315)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84098
Collection:CaltechAUTHORS
Deposited By: Lydia Suarez
Deposited On:04 Jan 2018 23:09
Last Modified:04 Jan 2018 23:09

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